A growing diplomatic dispute over Pakistan#39;s refusal to reopen supply routes for U.S. and other troops in Afghanistan threatened to overshadow President Barack Obama#39;s efforts on the last day of the NATO summit to finalize plans for ending the unpopular war.

President Barack Obama slipped into Afghanistan Tuesday night on the anniversary of the killing of 9/11 mastermind Osama bin Laden and signed an agreement cementing U.S. commitment to the nation after American combat troops leave.

President Barack Obama slipped into Afghanistan Tuesday night on the anniversary of the killing of 9/11 mastermind Osama bin Laden and signed an agreement cementing U.S. commitment to the nation after American combat troops leave. Charles Dharapak / APPresident Barack...

President Barack Obama#39;s willingness to engage with America#39;s adversaries comes with promise and peril, a reality hammered home by signs of progress in nuclear talks with Iran and a setback in North Korea#39;s provocative rocket launch.

WASHINGTON, April 5 (UPI) -- U.S. President Barack Obama Thursday signed a bill he called a quot;potential game-changerquot; for start-ups and small businesses.